DE60123963T2 - ANTENNA AND RADIO COMMUNICATION DEVICE WITH SUCH ANTENNA - Google Patents

Description

The The invention relates to an antenna for mobile communication as well a radio communication device containing the antenna.

Mobile communication devices, For example, portable phones and pagers have become more recent widely used. Mobile communication devices have a built-in antenna in a housing. A mobile communication device is a portable telephone with a built-in antenna, such as a commonly used Inverted F type antenna. The portable phone is a complex terminal, which is why it requires an antenna, desirably Signals in several frequency bands sends and receives.

10 shows a conventional antenna of the inverted-F type. The antenna 10 The inverted-F type includes a ground plane 11 , a conductive spotlight 12 , a short circuit section 14 for shorting the ground plane 11 and the radiator 12 and a dining section 15 for supplying energy to the antenna. The inverted-F type antenna has an antenna characteristic curve with a narrow frequency band as shown in FIG 9 is shown on.

The Document EP-A-1 024 552 discloses an antenna for radio-operated Communication terminals, which consist of different types of antennas, the only one Be fed point. In particular, the antenna comprises a plane conductive radiator (antenna of the inverted F type), which is parallel to the ground plane is arranged, and a meandering conductive Emitter coupled to the planar conductive emitter, wherein the feeding of the antenna and the connection with the ground plane over the Plan conductive spotlight takes place.

The publication JP 09 260934 shows a microstrip antenna that covers two frequency bands while maintaining their miniaturization. The microstrip antenna comprises two radiation conductors arranged in parallel and opposite a ground conductor via a dielectric layer. The radiation conductors are electrically short-circuited to the ground conductor. The one radiation conductor is formed as a feed element with a SpeI seabschnitt, whereas the other radiation conductor is designed as a parasitic element without feed part.

The publication JP 61 041205 (Japanese Patent Abstract) describes an antenna for a broadband transmission line comprising an auxiliary circuit board set opposite a radiation conductor element at a fixed location and a short-circuit conductor connecting a point of the supplementary circuit board and a point of the radiation conductor element. The electrical energy is supplied to the radiation conductor element or the printed circuit board via a feed.

The Document US-A-5,926,139 discloses a plane single antenna for Used in two frequency bands with radiation sections for two ribbons, the above a connecting portion connected and spaced from a ground plane are. Each radiation section is a plane antenna of the inverted-F type educated. A mass pin connects the connecting section and the ground plane each other while a single feed pin connects the connection section to the input / output port the transceiver circuit connects.

The Document US-A-5,786,793 discloses a compact antenna for circular Polarization with a substrate of a dielectric material, the at the bottom thereof with a ground plane and at the top thereof provided with four plan rectangular areas of an electrically conductive material is. Each of the four digits is at the ground plane at a short-circuit point shorted. A 90 ° hybrid circuit is connected so that it has only two adjacent locations with a phase difference of 90 ° directly feeds, making these two sites as active antenna elements be determined. The other two neighboring bodies will be not powered by the hybrid circuit, which is why it parasitic antenna elements represent.

The publication JP 09 107238 A shows a composite antenna arrangement that retains the sensitivity in communicating with the satellite as well as communicating with the ground. The composite antenna array includes a plane microstrip line antenna in the feedback system, an inverted-F type antenna, a ground conductor sharing the ground portion of the planer antenna and the inverted-F type antenna, a spiral type antenna, and a half-wave antenna.

The Document US-A-5,764,190 discloses as a planar antenna of Inverted F-type form is. In particular, a plane antenna of the inverted-F type, which are provided with a capacitive load is that allows a reduction in the dimensions of the antenna from the usual λ / 4 to λ / 8.

epiphany the invention

Provided is a small antenna used for a mobile communication device, such as a portable telephone, operating in a wide frequency band and covers several frequency bands.

This is achieved by the features set out in the independent claims are. Advantageous embodiments The present invention is set forth in the dependent claims.

The Antenna comprises a first conductive radiator with a planar shape and a second conductive radiator having a spiral shape. One Feed section consists of a plane element, is between the first conductive radiator with a flat shape and a ground plane arranged and leads Energy by means of electromagnetic coupling to, which is why the antenna can cover a wider frequency band.

Summary the drawing

1A Fig. 12 is a schematic front view of a portable telephone according to an exemplary embodiment 1 given as an example.

1B is a sectional view of the portable telephone.

2A FIG. 12 is a schematic perspective view of an antenna according to Embodiment 1. FIG.

2 B FIG. 10 is a sectional view of the antenna according to Embodiment 1. FIG.

3 FIG. 12 is a schematic sectional view of another portable telephone according to Embodiment 1. FIG.

4 FIG. 15 is a characteristic diagram showing a relationship between a frequency and a voltage standing wave ratio according to Embodiment 1. FIG.

5A is a schematic perspective view of an antenna according to an embodiment 2.

5B is a side view of the antenna according to embodiment 2.

5C is a plan view of the antenna according to embodiment 2.

6 FIG. 14 is a characteristic diagram showing a relationship between a frequency and a voltage standing wave ratio according to Embodiment 2. FIG.

7A FIG. 12 is a schematic perspective view of a modified antenna according to Embodiment 2. FIG.

7B FIG. 16 is a side view of the modified antenna according to Embodiment 2. FIG.

7C FIG. 10 is a plan view of the modified antenna according to Embodiment 2. FIG.

8A FIG. 12 is a schematic perspective view of another modified antenna according to Embodiment 2. FIG.

8B is a side view of another modified antenna according to embodiment 2.

8C FIG. 12 is a plan view of another modified antenna according to Embodiment 2. FIG.

9 FIG. 14 is a characteristic diagram showing a relationship between a frequency and a voltage standing wave ratio of a conventional antenna.

10 is a perspective view of a conventional antenna.

Detailed description of the preferred embodiments

Embodiment 1

1A Fig. 10 is a front view of a portable telephone according to an exemplary embodiment 1, 1B is a sectional view of the portable telephone. The portable phone 1 includes a housing 2 , a motherboard 3 of the portable phone, a battery 4 , a liquid crystal display 5 , a control knob 6 , an antenna 10 , a case 11 of the portable telephone, which acts as a ground plane, as well as a terminal 17 for connecting a ground plane of the antenna to the ground plane of the portable telephone.

In the in 1A structure shown, the shell 11 the motherboard 3 be used as a ground plane. The antenna is disposed on the case of the portable telephone in the present embodiment, although the antenna may be disposed directly on the motherboard with an internal ground plane (not shown) embedded in the motherboard.

The antenna 10 has a shape corresponding to the shape of the housing 2 of the portable telephone 1 , please refer 3 , can be modified.

2A is a perspective view of the antenna 10 according to Embodiment 1 of the present invention. 2 B is a cut t view of the antenna. The antenna 10 includes a ground plane 11 , a first conductive radiator 12 with a plane surface arranged parallel to the ground plane, a second conductive radiator 13 with a spiral-like shape, which is arranged parallel to the ground plane and connected to the first conductive radiator, a short-circuit section 14 formed over a corner of the ground plane, and a feeding section 15 which is formed substantially in the middle of the ground plane and insulated from the first conductive radiator and the ground plane. The first conductive spotlight 12 , the short circuit section 14 and the food section 15 are on a dielectric spacer 16 formed while the second conductive emitter 13 and a feeding element 15a are formed in the dielectric spacer. This makes it possible for each element to be stable with the dielectric spacer 16 and to make the antenna small by an effect of shortening the wavelength of the dielectric spacer. All elements may also be in the dielectric spacer 16 be educated. Alternatively, some of the elements may be formed on the spacer and others in the spacer. This too provides an antenna with similar advantages. Therefore, the structure of the antenna is not limited to the present embodiment.

4 shows an impedance characteristic of the antenna of 2A and 2 B , The marks in 4 refer to the frequencies 880 MHz, 960 MHz, 1710 MHz and 1990 MHz. 9 shows an impedance characteristic of a conventional antenna of 10 , The marks in 9 refer to the frequencies 1710 MHz and 1990 MHz. According to the comparison between 4 and 9 rejects the antenna from 2A Resonances in two frequency bands. This is due to the fact that the first conductive spotlight 12 with a flat shape and the second conductive spotlight 13 have different resonance frequencies with a spiral shape. In addition, the helical shape of the conductive radiator allows a small configuration of the antenna.

The food section 15 , which consists of the planar element, is electromagnetic with the conductive radiators 12 and 13 coupled. Therefore, the antenna operates in wider frequency bands than an antenna based on a conventional feeding method, which results from the feeding section using an electromagnetic coupling which acts as a matching circuit.

The food section 15 widened due to the fact that it is essentially in the middle of the ground plane 11 is arranged, the frequency bands. This is because this arrangement causes a substantially uniform distribution of the current flowing on the right and left sides of the ground plane and can eliminate a phase difference so as to provide wider frequency bands.

The short-circuit section 14 is over a corner of the ground plane 11 arranged, whereby the frequency bands are widened. This is because this arrangement can direct the directions of currents flowing through the conductive radiators and the ground plane in the same direction.

The connecting portion between the second conductive radiator 13 with a spiral shape and the first conductive radiator 12 Plane shape is essentially opposite to the shorting section 14 with respect to the food section 15 arranged, thereby widening the frequency bands. This is because this arrangement allows the feed section to match the conductive radiators. In addition, the second conductive spotlight allows 13 due to its spiral nature, the antenna is made smaller than a conventional antenna according to two frequency bands.

The plane feed element 15a has an area of 20 × 20 = 400 mm ² , while the first conductive radiator 12 has an area of 25 × 25 = 625 mm ² , and therefore the ratio between them is about 2 to 3.

The Feed element may be due to the area ratio of about 2 to 3 between the first conductive radiator an unwanted coupling with the second suppress conductive emitters, while the coupling with the first conductive radiator is maintained, why an adaptation to the conductive spotlight is possible.

According to this embodiment, measure the ground plane 11 110 × 35 mm, the first conductive spotlight 12 25 × 25 mm, the second conductive emitter 13 25 × 7 × 3 mm, the plane feed section 15 20 × 20 mm and an interval between the feed section and the first conductive radiator 0.5 mm. 4 shows the impedance characteristic of the antenna. The antenna according to this embodiment has a size such that it can be installed in a housing and can operate at frequency bands of 880 to 960 MHz and 1710 to 1990 MHz, and therefore has a desired characteristic curve.

The present invention is not limited to this embodiment. Each element can be optimized such that an antenna and a portable radio communication device corresponding to frequency bands such as 880 to 960 MHz (GSM) and 1710 to 1880 MHz (DCS) or frequency bands such as 880 to 960 MHz and 1710 to 2170 MHz, or frequency bands such as 824 to 894 MHz (AMPS) and 1850 to 1990 MHz (PCS).

Embodiment 2

5A Fig. 12 is a schematic perspective view of an antenna according to an exemplary embodiment 2 of the present invention; 5B is a side view of the antenna and 5C a plan view of the antenna. The antenna of Embodiment 2 differs from the antenna of Embodiment 1 according to FIG 2A by a feed element partially connected to a shorting section and by a second conducting element having a meander-like shape instead of a spiral-like shape.

In 5A can as a ground plane 21 the sheath (not shown) on the motherboard is used similarly to Embodiment 1, or also an internal ground surface (not shown) embedded in the motherboard. A slot 22a is at a portion of the first conductive radiator 22 with a planar shape in an arrangement substantially parallel to the ground plane 21 educated. The slot 22a has a position, length or width that is aimed at regulating the impedance of the antenna.

A second conductive spotlight 23 with a meander-like shape in an arrangement parallel to the ground plane 21 has a folded portion having a folded portion 23a forms. This structure allows the antenna to have a substantially extended length, therefore, a small configuration is effective for the antenna. The folded section 23a can with a folded portion of the first conductive radiator 22 be formed, which is why the antenna can be made small.

A short circuit section 24 , the first conductive spotlight 22 and the ground plane 21 short circuit is at a corner of the first conductive radiator 22 educated. A food section 25 is essentially parallel to the ground plane 21 formed and has a planar feed element 25a having substantially the same longitudinal length as the first conductive radiator 22 and a slightly greater transverse length as the radiator. A section of the feed element 25a is with the shorting section 24 via a connecting section 24a connected while another section with the second conductive radiator 23 connected is.

The feeding element 25a has a folded portion only in a portion on one side thereof, whereby a folded portion 25b is formed. This structure allows the antenna to have a substantially extended length, and therefore, the antenna can be made small. A slot 25c is in a section of the feed element 25a educated. The slot 25c has a position, length or width that are controlled so that control of the impedance of the antenna can be made.

The slot 25c is longer than the slot 22a in the first conductive emitter 22 and the slot 22a facing while slightly deviating from the slot. The antenna has an impedance that can be regulated depending on the positional relationship between the slots.

The antenna according to this embodiment includes, similar to Embodiment 1, the above-explained elements that may be formed on or in a dielectric spacer (not shown). For example, the first conductive emitter 22 and the second conductive emitter 23 , the short circuit section 24 as well as the food section 25 be formed on the dielectric spacer, while the feed element 25a may be formed in the dielectric spacer. All elements may also be formed in the dielectric spacer. Each structure represents an antenna with similar advantages as in Embodiment 1.

The second conductive spotlight 23 , the folded section 23a , the food section 25 , the feeding element 25a , the folded section 25b and the slot 25c can be made from a single single-cut and folded conductive surface, allowing for efficient antenna fabrication.

6 shows an impedance characteristic of the antenna of the present embodiment. The marks in 6 refer to the frequencies 880 MHz, 960 MHz, 1710 MHz and 1990 MHz, similar 4 , The feeding element 25a has a section that connects to the shorting section via the connecting section 24a in the in 5A is shown connected structure, so that the antenna substantially comprises two antenna elements of the inverted-F type. The two inverted-F type antenna elements have an impedance characteristic with a double vertex shape (characteristic curve with two resonance frequencies) when matching their resonances and coupling with each other, and operate in a wider frequency band.

A modification of in 5A is shown below 7A described.

7A is a schematic Perspektivan view of the modified antenna according to Embodiment 2 of the present invention, 7B is a side view of the antenna and 7C a plan view of the antenna. The modified antenna differs from the antenna of Embodiment 2 according to FIG 5A by a portion of a feed element that is not connected to a shorting section but directly to a ground plane. Elements similar to those of 5A are denoted by the same reference numerals, and a description of selbiger components omitted.

As in 7A is shown is a short circuit section 25d at a portion of a planar feeding element 25a arranged. The short-circuit element 25d can easily with a folded section of the planar feed element 25a be formed by the structure according to 5A is different, which is why an efficient production of the antenna is possible. In 5A is a section of the planar feed element 25a with the shorting section 24 over the connecting section 24a connected. A second conductive spotlight 23 , the food section 25 , the feeding element 25a , the folded section 25b , The slot 25c and the shorting section 25d can be made from a single-cut and folded single conductive surface, which improves the manufacturability of the antenna.

Another modification of the antenna from 5A will be explained below 8A explained.

8A FIG. 12 is a schematic perspective view of another modification of the antenna according to Embodiment 2 of the invention; FIG. 8B is a side view of the antenna and 8C a plan view of the antenna. The modified antenna differs from the antenna of Embodiment 2 according to FIG 5A by a second conductive radiator having a spiral shape instead of a meandering shape. Elements similar to those in 5A are denoted by the same reference numerals, and a description of these elements is omitted.

In 8A is the second conductive spotlight 26 formed in a spiral shape, resulting from the meandering shape of the second conductor element 23 according to 5A different. The second conductor element 26 may consist of a single cut and folded conductive surface in a different way than that of the spiral-like second conductor 13 according to 1A the case is to be manufactured, allowing efficient manufacture of the conductive radiator 26 allows. The second conductive spotlight 26 , the food section 25 , the feeding element 25a and the slot 25c can be made from a single cut and folded conductive surface, which improves the manufacturability of the antenna.

As in 8B and 8C is shown, the first conductive radiator 22 and the feeding element 25a the antenna of 8A the same sizes, which differs from the antenna according to 5A differ. The slots 22a and 25c are essentially facing each other, which is why the feed element 25a does not have a folded portion.

The Antenna has an impedance which, depending on the presence, the location, the length or width of each slot and a positional relationship between the slots Slots is regulated.

commercial applicability

The present invention provides a small broadband antenna the multiple frequency bands covers, as well as a radio communication device, the antenna contains. A feed section comprises a planar feed element and is connected via a powered by electromagnetic coupling, creating an antenna provided with a wider band characteristic. Respective Portions of a shorting section and the feeding element as well as the size and arrangement Each element is optimized to make one antenna wider Band characteristic curve at desired Provide frequency.

1

portable phone

2

casing

3

motherboard

4

battery

5

liquid-crystal display

6

control knob

10

antenna

11

ground plane

12

first conductive spotlight

13

second conductive spotlight

14

Shorting section

15

feeding section

16

dielectric spacer

17

connection port

Claims (26)

An antenna comprising: a ground plane ( 11 ); a first conductive radiator ( 12 ), which has a planar shape and is arranged substantially parallel to the ground surface; a second conductive emitter ( 13 ) having a spiral-like shape or a meander shape and arranged substantially parallel to the ground plane, the second conductive radiator being coupled to a portion of the first conductive radiator; a short-circuit section ( 14 ) shorting the first conductive radiator and the ground plane; and a food section ( 15 ) supplying energy to the first and second conductive radiators; characterized in that the feed section is a planar feed element ( 15a ) disposed between the first conductive radiator and the ground plane, the feed element facing the first conductive radiator and overlapping at least partially with the first conductive radiator, the feed element being electromagnetically coupled to the first conductive radiator, and the feed element electromagnetically is coupled or connected to the second conductive radiator. An antenna according to claim 1, wherein a ratio of a area of the feed element to a surface of the first conductive radiator is substantially 2: 3. Antenna according to claim 1 or 2, wherein the feed element ( 25a ) parallel to the ground plane ( 21 ) is arranged and the distance between the feed element ( 25a ) and the first conductive radiator ( 12 ) is between 0.2 mm and 2 mm. An antenna according to any one of claims 1 to 3, wherein the feed element is essentially square. An antenna according to claim 4, wherein one side of the feed element a length between 10 and 20 mm. An antenna according to any one of claims 1 to 4, wherein the feed element is coupled to the shorting section. An antenna according to any one of claims 1 to 5, wherein the feed element with the ground plane is coupled. An antenna according to any one of claims 1 to 7, wherein a first slot ( 25c ) is formed in the feed element. An antenna according to claim 8, wherein the impedance is dependent regulated by a shape and a position of the first slot can be. An antenna according to claim 8, wherein a second slot ( 22a ) is formed in the first conductive radiator and substantially facing the first slot. An antenna according to claim 10, wherein the impedance in the dependence of respective shapes and positions of the first slot and the second slot can be regulated. An antenna according to any one of claims 1 to 11, wherein the feed element comprises a folded section (Fig. 25b ) which is formed by folding a portion of the feed element. An antenna according to any one of claims 1 to 12, wherein the second conductive radiator with the first conductive spotlight on a Shorting section opposite Side is coupled. An antenna according to any one of claims 1 to 13, wherein one side the ground plane a length between 50 and 120 mm and the other side of it has a length between 20 and 40 mm. An antenna according to any one of claims 1 to 14, wherein the first conductive radiator is essentially square. An antenna according to claim 15, wherein one side of the first conductive spotlight a length between 20 and 25 mm. An antenna according to any one of claims 1 to 16, wherein the second conductive emitter essentially measures 7 × 25 × 3 mm. An antenna according to any one of claims 1 to 17, wherein the first and the second conductive emitter frequency bands from 880-960 MHz or 1710-1880 MHz, frequency bands from 880-960 MHz or 1710-1990 MHz, frequency bands from 880-960 MHz or 1710-2170 MHz and frequency bands of 824-894 MHz or 1850-1990 MHz correspond. An antenna according to any one of claims 1 to 18, further comprising a dielectric spacer ( 16 ) including the first and second radiators, the shorting section and the feeding section thereon or therein. Antenna according to one of claims 1 to 7, wherein a slot ( 22a ) is formed in the first conductive radiator. An antenna according to claim 20, wherein the impedance in dependence be regulated by a shape and a position of the slot can. An antenna according to any one of claims 1 to 21, wherein the first conductive spotlight contains a folded section, the is formed by a part of the first conductive radiator is folded. An antenna according to claim 1, wherein said second conductor element is formed in a meandering shape and has a folded portion (Fig. 23a ) contains, the is formed by folding a part of the second conductive radiator. A radio communication device comprising: the antenna ( 10 ) according to any one of claims 1 to 23; and a motherboard ( 3 ) coupled to the ground plane and the first and second conductive radiators, the first and second conductive radiators and the ground plane being formed from one piece. A radio communication device comprising: the antenna ( 10 ) according to any one of claims 1 to 23; and a housing ( 2 ) receiving the antenna, the shorting portion being formed over a corner of the ground plane. A radio communication device comprising: the antenna ( 10 ) according to any one of claims 1 to 23; and a housing ( 2 ) for receiving the antenna, wherein the second portion is disposed on a center line of the ground plane.